Are you at all concerned the airlines will remove the air from the cabin if you try this, just to emphasize that you’re not going to get a refund this way?
Anyway I’ll be across the aisle with hydrogen balloons paying less than you either way. Enjoy your flight!
Mass and volume both count, in an aircraft, don't they? And many oversize humans present logistical and safety challenges:
- Taking up more than one seat with girth, needing a seatbelt extender.
- Fitting through narrow passages, tight turns, limited headroom
- An unconscious person may need to be lifted, and transported somehow
- Toilets and life vests and other safety equipment, rated for your "standard average man size"
- Total mass of passengers/cargo, and its distribution on the aircraft itself
Elevators in the US have a maximum weight and maximum occupancy rating.
Arguably, if obesity is a disability, then appeal to the Americans with Disability Act or similar regulations, but from a standpoint of safety and the common good, it does not seem unreasonable for airlines to charge extra to cover their expenses above.
Anyway I’ll be across the aisle with hydrogen balloons paying less than you either way. Enjoy your flight!